Carbhub 49mm Cylinder Piston Assembly for Stihl MS390/MS290/MS310 — Rebuild Kit with Decompression & Bearings

Carbhub's 49mm cylinder piston assembly is a complete aftermarket engine rebuild kit designed to restore compression and performance to compatible Stihl MS390, MS290, MS310, 029 and 039 chainsaws.

If your Stihl chainsaw is showing reduced power, excessive smoke, or hard starting, replacing the cylinder and piston with a matched assembly can bring stronger, more consistent combustion. This Carbhub kit replaces OEM part 1127 020 1216 and includes the cylinder (with decompression hole), piston, crankshaft components and all necessary seals and fasteners to simplify installation.

Which Stihl models will this assembly fit?

This replacement is engineered for specific Stihl two-stroke saws. It fits MS390, MS290, MS310 and the legacy 029 and 039 models when those engines use a 49mm bore and the decompression-style cylinder.

• Direct fit for Stihl MS390, MS290, MS310, 029, 039 using 49mm cylinders
• Replaces OEM number 1127 020 1216 for compatible engines
• Not suitable if your original cylinder lacks the decompression hole

What parts are included in the kit and why they matter?

The kit arrives complete so you can rebuild the top and bottom end without sourcing extra parts. Included bearings, oil seals and the piston pin needle cage bearing help ensure the rotating assembly runs true and is protected against oil and dirt infiltration.

• One 49mm cylinder with decompression hole and matching piston
• Crankshaft, engine bottom cover, two crank main bearings and oil seals
• Piston pin needle cage bearing, four cylinder mounting screws, spark plug and decompression valve

How will installing this assembly affect saw performance?

Replacing a worn cylinder and piston restores compression and combustion efficiency, which usually leads to stronger throttle response and easier starting. Properly sealed bearings and oil seals also reduce leakage and prolong engine life when installed correctly.

• Improved compression for more reliable power delivery
• New bearings and seals reduce oil and air leakage
• Decompression valve eases starting on compatible engines

What installation points should I check before buying?

Confirm your current cylinder has a decompression hole before ordering—this kit will not match cylinders without that feature. Also verify the engine uses a 49mm bore and compare your OEM number to 1127 020 1216 to ensure compatibility.

• Verify cylinder bore is 49mm and has decompression hole
• Compare your saw's OEM part number to 1127 020 1216
• Use basic engine service tools and follow torque specs during installation

Who this is for: This Carbhub assembly is aimed at DIYers, small-timber contractors and repair shops that need a full, economical top-and-bottom-end replacement for compatible Stihl saws. If you can remove the cylinder and crank components or have access to a technician, this kit supplies the common parts required to return a fatigued two-stroke engine to dependable service. Do not purchase if your original cylinder lacks the decompression hole or your model uses a different bore size.